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Preparation method of iron-containing dust sludge pellets

A technology for iron dust sludge and pellets, which is applied in the field of metallurgy, can solve the problems of increasing the smelting cost of steel in the steelmaking process, affecting the quality of molten iron, and having a large impact on smelting.

Inactive Publication Date: 2020-12-01
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In recent years, with the continuous upgrading of the strength of steel materials, the requirements for clean steel production have become higher and higher. Although the existing iron-containing dust and sludge pellets return molten iron utilization methods have realized the recovery of ferrite, they have also brought A large number of impurity elements affect the quality of molten iron and increase the cost of smelting steel in the steelmaking process
In particular, the S element in the dust and sludge is easy to enter the molten iron from the slag, causing "returning sulfur", which has a great impact on the smelting of low-sulfur steel such as automobile plates.

Method used

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  • Preparation method of iron-containing dust sludge pellets
  • Preparation method of iron-containing dust sludge pellets
  • Preparation method of iron-containing dust sludge pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Embodiment one (as figure 1 shown):

[0066] A) The ingredients of the iron-containing dust sludge used in the test are: TFe 31.7%, CaO 12.8%, MgO 5.1%, SiO2 13.7%, Al2O3 6.4%, MnO 0.6%, K2O 0.9%, Na2O 0.7%, S 1.8%, P2O5 0.2%, CaF20.4, Zn 1.8%, C 13.2%, moisture 0.5%, the particle size characteristics of the iron-containing dust sludge raw material are: 100 mesh sieve residue = 10.0%, 20 mesh sieve residue = 0.8%, TFe4.5%, it needs to be mixed with high iron dust sludge raw materials;

[0067] The raw material composition of high iron dust sludge is: TFe 69.7%, CaO 1.5%, MgO 0.6%, SiO 2 1.2%, Al 2 o 3 0.4%, MnO 0.2%, K 2 O 0.3%, Na 2 O 0.4%, S 0.5%, P 2 O0.1%, CaF 2 0.1, Zn 0.0%, C0.2%, moisture 0.5%, the particle size characteristics of high iron dust sludge raw materials are: 100 mesh sieve residue = 9.0%, 20 mesh sieve residue = 0.8%;

[0068] Mix the iron-containing dust sludge raw material and the high-iron dust sludge raw material at a ratio of 1:3, and...

Embodiment 2

[0094] A) The ingredients of iron-containing dust sludge used in the detection are: TFe 40.5%, CaO 5.2%, MgO 2.3%, SiO25.1%, Al2O3 1.2%, MnO 0.3%, K2O 0.4%, Na2O 0.3%, S 1.3%, P2O5 0.1%, CaF2 0.2, Zn 2.1%, C 25.7%, moisture 0.4%, the particle size characteristics of iron-containing dust sludge raw materials are: 100 mesh sieve residue = 9.0%, 20 mesh sieve residue = 1.0%, TFe2 >4.5%, it needs to be mixed with high-speed iron dust and mud raw materials;

[0095] The raw material composition of high iron dust sludge is: TFe 70.5%, CaO 1.6%, MgO 0.5%, SiO 2 0.8%, Al 2 o 3 0.5%, MnO 0.2%, K 2 O 0.3%, Na 2 O 0.3%, S 0.1%, P 2 o 5 0.0%, CaF 2 0.0, Zn 0.0%, C0.2%, moisture 0.7%, the particle size characteristics of high iron dust sludge raw materials are: 100 mesh sieve residue = 8.0%, 20 mesh sieve residue = 1.0%;

[0096] Mix the iron-containing dust sludge raw material and the high-iron dust sludge raw material at a ratio of 1:1, and the chemical composition of the obtai...

Embodiment 3

[0120] A) The ingredients of the iron-containing dust sludge used in the test are: TFe 47.9%, CaO 10.8%, MgO 3.9%, SiO 27.4%, Al2O3 4.1%, MnO 0.8%, K2O 0.5%, Na2O 0.8%, S 1.7%, P2O5 0.4%, CaF2 0.2, Zn 2.3%, C 2.2%, moisture 0.4%, the particle size characteristics of iron-containing dust and sludge raw materials are: 100 mesh sieve residue = 8.0%, 20 mesh sieve residue = 0.9%, TFe2 >4.5%, it needs to be mixed with high-speed iron dust and mud raw materials;

[0121] The raw material composition of high iron dust sludge is: TFe 71.3%, CaO 1.2%, MgO 0.4%, SiO 2 0.7%, Al 2 o 3 0.3%, MnO 0.3%, K 2 O 0.2%, Na 2 O 0.2%, S 0.1%, P 2 o 5 0.0%, CaF 2 0.0, Zn 0.0%, C0.0%, moisture 0.6%, the particle size characteristics of high iron dust sludge raw materials are: 100 mesh sieve residue = 10.0%, 20 mesh sieve residue = 0.7%;

[0122] Mix the iron-containing dust sludge raw material and the high-iron dust sludge raw material at a ratio of 1:1, and the chemical composition of the ...

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Abstract

The invention relates to the technical field of metallurgy, and discloses a preparation method of iron-containing dust sludge pellets, which optimizes the components and preparation technique of the iron-containing dust sludge pellets by controlling the types of raw material dust sludge and combining the metallurgical thermodynamics theory. According to the preparation method of the iron-containing dust-mud pellets, recovery of iron elements can be achieved, meanwhile, S elements possibly entering molten iron are effectively controlled, the S elements are reserved in slag and removed in the slag falling process of the molten iron, and the quality of the molten iron is guaranteed.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing iron-containing dust and sludge pellets. Background technique [0002] Iron-containing dust is a typical solid waste in iron and steel metallurgical enterprises, and its resource utilization has always been a hot issue in the utilization of solid waste in iron and steel enterprises. Typical utilization methods include returning to sintering, returning to torpedo tank cars, returning to converters, using at the factory, centralized disposal in rotary hearth furnaces and rotary kilns, etc. Among them, returning iron-containing dust and sludge cold-pressed pellets to torpedo tankers or iron ladles for utilization is a kind of iron-containing dust and sludge utilization method that has been studied and applied more. [0003] Iron-containing dust and sludge is a kind of complex material, involving multiple processes such as sintering, ironmaking, steelmaking...

Claims

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Application Information

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IPC IPC(8): C22B1/248
CPCC22B1/2406C22B1/248Y02P10/20
Inventor 康凌晨张树华马贵生周克飞刘瑛张华
Owner 武汉钢铁有限公司
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